Question

1. Which substance give heat and light after combustion

a. Flame

b. Fuel

c. Combustion

d. None of these


2. Like fuel the sun also provides heat and light. The process taking place in the sun is called

a. Combustion

b. Nuclear process

c. Burning

d. All of these


3. Coal burns with ______

a. Flame

b. Only glow

c. Both flame and glow

d. None of these


4. Burning of charcoal in a closed room will produce

a. Carbon dioxide

b. Nitrogen dioxide

c. Carbon monoxide

d. All of these


5. The substances which have very low ignition temperature will

a. Catch fire easily

b. Will not catch fire

c. Catch fire after some time

d. None of these


6. CNG and LPG are the examples of

a. Solid fuels

b. Liquid fuels

c. Gaseous fuels

d. They are not fuels


7. Ignition temperature is

a. Lowest temperature at catch fire

b. Higher temperature at catch fire

c. Any temperature

d. None of these


8. Combustion is a

a. Chemical process

b. Physical process

c. Both of these processes

d. None of these processes





9. The products of combustion are

a. Carbon dioxide and water

b. Oxygen and water

c. Only carbon dioxide

d. Only oxygen





10. There are following zones of a flame

a. Two

b. Three

c. Four

d. No any zone


11. Which one of the following gases is used in combustion?

(a) Hydrogen

(b) Oxygen

(c) Nitrogen

(d) Carbon dioxide


12. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called

(a) calorific value

(b) significant value

(c) heat value

(d) internal energy


13. Out of these, which is able to control fires?

(a) NH3

(b) H2

(c) CO2

(d) F2


14. Which zone of a flame does a goldsmith use for melting gold and silver ?

(a) Outer zone

(b) Middle zone

(c) Inner zone

(d) Lower zone


15.What is the main chemical component present in striking surface of a matchbox?

A. Potassium chlorate

B. Phosphorus

C. Potassium

D. Graphite


16. The combustion reaction which occurs on its own, without any external supply of heat is called as:

A. Explosion

B. Spontaneous combustion

C. Fire

D. Rapid combustion


17. The SI unit of the calorific value of a fuel is :-

A. N/kg

B. KJ/kg

C. KW/kg

D. J/kg


18. Which of the following should be done to control fire?

A. Increase the oxygen supply

B. Increase fuel supply

C. Reduce the heat supply

D. Reduce the nitrogen supply


19Which of the following has lower ignition temperature?

a. Wood

b. Paper

c. Vegetable oil

d. Kerosene oil


20. Rapid combustion is

a. When gas burns, it produces heat and light

b. When material suddenly burst into flames

c. When there is evolution of heat

d. None of these​

Answer 1

Answer:

b) Fuel

Explanation:

Fuel when combusted gives heat energy and if is highly inflammable then it catches fire quickly and also releases light energy.

2) b. Nuclear process( nuclear fission)

3) c. Both flame and glow

4) c. Carbon monoxide

5) a. Catch fire easily

6) c.Gaseous fuels( LPG is liquid though)

7) a. Lowest temp. at which a substance catches fire

8) a. Chemical process

9) a. Carbon dioxide and water( water vapours)

10) b. 3 zones

11) b. Oxygen

12) a. calorific value

13) c. CO2

14)a. outer zone

15) a. Potassium chlorate

16) b.Spontaneous combustion

17) c. KJ/kg

18) c. reduce the heat supply

19) d. Kerosene oil

20) b. When material suddenly burst into flames

Answer 2

Answer:

1. A

2. A

3. C

4. C

5. C

6. C

7. B

8. A

9. D

10. C

11. B

12. A

13. C

14. B

15. B

16. B

17. D

18. not sure

19. C

20. B

Note :- Please go through your book ones as all the questions are from within the chapter. READ THE CHAPTER.